condition mean min max ZT0-3 0.17506318225 0.172549751 0.1775766135 ZT4-7 0.1683433205 0.161478291 0.17520835 ZT8-11 2.536354869 0.5050025025 4.5677072355 ZT12-15 9.060836612500001 7.445447822 10.676225403 ZT16-19 5.674754415000001 4.4520027395 6.8975060905 ZT20-23 1.38552240275 1.0022479045 1.7687969010000002